Overall turnout for the referendum was 42%, with 6,152,607 voters backing the proposal and

13,013,123 rejecting it

An estimated 19.1million people voted in the AV referendum - higher than commentators had anticipated.
Amid electoral reform apathy, in London 35.4 per cent went to the polls, even though no other elections were taking place.

Turnout was as high as 50.7 per cent in Scotland where Scottish Parliamentary elections were being held at the same time.
Turnout by region
London - 35.4% of 1.86 million registered voters
South East - 44.3% of 2.79 million registered voters
South West - 44.6% of 1.80 million registered voters
Eastern - 43.1% of 1.84 million registered voters
West Midlands - 39.8% of 1.63 million registered voters
East Midlands - 42.8% of 1.43 million registered voters
Yorkshire and the Humber - 39.9% of 1.53 million registered voters
North West - 39.1% of 2.05 million registered voters
North East - 38.7% of 0.76 million registered voters
Scotland - 50.7% of 1.98 million registered voters
Wales - 41.7% of 0.95 million registered voters